Re: [patch, libgfortran] Fix PR27304 Data descriptors exhausted

[Jerry DeLisle <jvdelisle at verizon dot net>]

Brooks Moses wrote:
> Brooks Moses wrote:
>
> > Thus, I'm a bit baffled: is it possible for this error to occur except 
> > in the case (from your test program) where there are no data 
> > descriptors in the format at all?  If not, perhaps an error message of 
> > "No data descriptors found in format" would be better.
>
>
> And, of course, just as I hit send, I thought of a better wording (I 
> think): "Format for nonempty I/O list contains no data descriptors"
>
> - Brooks
The error occurs if there has been a reversion and no descriptors available. 
There is a data descriptor available in the following example so the above 
message just doesn't quite fit.

      program test
      implicit none
      integer :: n
      n = 1
      write(*,"(i7,(' abcd'))") n, n
      end program test


So I would like to propose the error say:

At line 5 of file fmt_exhaust.f90
Fortran runtime error: Missing data descriptor in format after reversion

I will amend the patch accordingly unless anyone has grief with this.  I just 
wanted to come up with something brief and to the point.

Is this OK to commit?

Regarding a test case.  See my thread on "Testing for run-time errors"

Thanks all,

Jerry